JP2008084290A - Coin identification method and identification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance coin sorting method and identification device with compact, inexpensive and simple configuration. <P>SOLUTION: The identification device is equipped with a coin passage through which the coin passes, a first coil arranged at one side part of the coin passage, a second coil which is electromagnetically coupled with and facing the first coil and arranged at the other side part of the coin passage, and an oscillation circuit for outputting a sinusoidal signal for exciting the first coil, and identifies the coin based on the signal outputted from the second coil. The first coil is excited by at least two frequencies in time division. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coin identification method and identification apparatus used in a vending machine or the like.

  Conventionally, an electronic coin discriminating apparatus has a general configuration in which an oscillation coil excited by a signal of a predetermined frequency is arranged on one side portion of a coin passage and electromagnetically coupled to the excitation coil on the other side portion. A receiving coil is provided, the authenticity and type of the coin are determined based on the decay voltage waveform from the receiving coil generated when the coin is currency, and the authenticity of the coin is inspected based on the determination result.

  Further, in the conventional electronic coin discriminating apparatus, a plurality of a pair of coin detecting coils each including an oscillation coil and a receiving coil are provided to detect the material, material pressure, outer diameter, etc. of the coin to be examined. Things have also been proposed. In addition, there are a method for individually giving signals of different frequencies to each oscillation coil and a method for forming a self-excited oscillation circuit by using the oscillation coil itself as an element of the oscillation circuit. A plurality of independent drive circuits or oscillation circuits are provided to excite each oscillation coil.

Patent Document 1 discloses a technique for selecting coins from peak levels of envelopes of a composite signal of a plurality of frequency bands by exciting with a non-sinusoidal signal including a plurality of frequency components. Thus, a method is disclosed in which a clad coin or the like, which is made of copper as a core material and is made of a different material between the inside and the vicinity of the surface where the thin pieces of white copper are superposed on the core material, is selected with an inexpensive configuration.
Japanese Patent No. 2567654

  Since the conventional coin discriminating apparatus requires a plurality of oscillation circuits and oscillation coils in order to improve the coin sorting performance, there has been a problem of cost increase due to an increase in the number of parts. In addition, since each oscillation coil is excited with a different frequency, mutual interference is likely to occur between these coils, and in order to prevent this, it is necessary to devise measures such as increasing the distance between the coils. There was a problem such as having to lengthen.

  In addition, the conventional coin sorting device described above, for example, the coin sorting device described in Patent Document 1, does not need to provide a plurality of oscillation circuits and oscillation coils by exciting with a non-sinusoidal signal including a plurality of frequency components. However, the harmonic components of non-sinusoidal signals are easily affected by parasitic capacitance such as wiring, and the frequency or amplitude of the harmonic components is likely to change due to disturbance noise, etc., so the output is not stable. There was a problem.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a high-performance coin sorting method and identification apparatus that are excellent in economic efficiency, downsized, inexpensive and simple in configuration. is there.

The present invention employs the following configuration in order to solve the above problems.
That is, according to one aspect of the present invention, the coin identifying device of the present invention includes a coin passage through which a coin passes, a first coil disposed on one side of the coin passage, and other than the coin passage. A second coil that is electromagnetically coupled to face the first coil disposed on the side, and an oscillation circuit that outputs a sine wave signal that excites the first coil. In the identification device for identifying the coin based on the signal output from the first coil, the first coil is excited by time division at at least two frequencies.

In the coin identification device of the present invention, it is preferable that the oscillation circuit is one oscillation circuit that outputs at least two frequencies in a time division manner.
In the coin identification device of the present invention, it is desirable that the oscillation circuit is a plurality of oscillation circuits that output different single frequencies.

  According to one aspect of the present invention, the coin identifying device of the present invention includes a coin passage through which a coin passes, a first coil disposed on one side of the coin passage, and the other side of the coin passage. A second coil that is electromagnetically coupled to the first coil disposed on the first coil, and an oscillation circuit that outputs a sine wave signal that excites the first coil. In the identification device for identifying the coin based on a signal output from the second coil, a signal based on at least two or more criteria is generated for the signal output from the second coil, and the at least two or more criteria are generated. The coin is identified based on a signal based on.

  According to one aspect of the present invention, the coin identifying device of the present invention includes a coin passage through which a coin passes, a first coil disposed on one side of the coin passage, and the other side of the coin passage. A second coil that is electromagnetically coupled to the first coil disposed on the first coil, and an oscillation circuit that outputs a sine wave signal that excites the first coil. In the identification device for identifying the coin based on the signal output from the second coil, a difference signal between the signal output from the second coil and a predetermined reference signal is obtained, and the difference between the difference signal and the sine wave signal is obtained. A phase difference is obtained, and the coin is identified based on the amplitude of the difference signal and the phase difference.

  According to the present invention, by exciting a set of coils at at least two or more frequencies, a clad coin made of a plurality of materials can be identified, and a high performance, small and inexpensive coin identifying device can be realized.

  In addition, according to the present invention, it is possible to identify a clad coin made of a plurality of materials by exciting a set of coils at one frequency and switching the reference of the detection circuit, thereby identifying a coin that is high performance, small and inexpensive. A device can be realized.

  In addition, according to the present invention, by exciting a set of coils at one frequency and detecting the amplitude and phase, it is possible to identify clad coins made of a plurality of materials, such as clad coins made of a plurality of materials, etc. A high-performance, small, and inexpensive coin recognition device can be realized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a coin identifying device according to a first embodiment of the present invention.
The coin identification device according to the first exemplary embodiment of the present invention includes an oscillation coil 103 on one side of a coin passage 102 through which a test coin 101 to be inspected passes, and another coin passage facing the oscillation coil 103. A receiving coil 104 is disposed on the side.

  The oscillating coil 103 is connected to a frequency switching circuit 105 for switching a signal for exciting the oscillating coil 103. The frequency switching circuit 105 includes a first sine wave oscillation circuit 106 that outputs a sine wave of a single frequency A and a single frequency. Each is connected to a second sine wave oscillation circuit 107 that outputs a B sine wave.

The reception coil 104 is connected to the coin detection circuit 108, and the output of the reception coil 104 is input to the coin detection circuit 108.
The oscillation coil 103 is excited by a frequency A or B sine wave via a frequency switching circuit 105.

  The oscillation coil 103 and the reception coil 104 are arranged to face each other with the coin path 102 interposed therebetween. When the oscillation coil 103 is excited and a magnetic flux is generated thereby, an induced electromotive force is generated in the reception coil 104. Thus, the oscillation coil 103 and the reception coil 104 are electromagnetically coupled.

  When the test coin 101 passes between the oscillation coil 103 and the reception coil 104, the mutual inductance M between the oscillation coil 103 and the reception coil 104 changes. Thereby, the signal generated in the receiving coil 104 changes. Since the change in the mutual inductance M varies depending on the material and type of the coin to be tested 101, the material and type of the coin to be tested 101 can be determined by examining the signal generated in the receiving coil 104.

  The coin detection circuit 108 outputs the output of the reception coil 104 as a coin signal A or B corresponding to the frequency for exciting the oscillation coil 103. That is, the output of the receiving coil 104 when the oscillation coil 103 is excited with the frequency A is the coin signal A, and the output of the receiving coil 104 when the oscillation coil 103 is excited with the frequency B is the coin signal B. Coin signal A and coin signal B are input to a coin discriminating circuit (not shown) connected to coin detecting circuit 108.

Based on the coin signals A and B, in a coin discriminating circuit (not shown), whether the coin to be examined is a genuine coin or a fake coin is discriminated between true and false and the type is discriminated.
FIG. 2 is a timing chart showing the frequency signals A and B applied to the oscillation coil 103.

As shown in FIG. 2, signals of frequency A and frequency B are alternately input to the oscillation coil 103. Thus, the frequencies A and B are switched in a time division manner.
The switching of the frequency is determined based on the approximate time that the test coin passes through the coil. For example, when the coin is passed about 50 times and the passing time of the coin to be examined is 100 ms, the time-division switching period is 2 ms.

  As shown in FIG. 1, the coin signal A is the output of the receiving coil 104 when the oscillation coil 103 is excited with the signal of the frequency A, and the coin signal B is the receiving coil when the oscillation coil 103 is excited with the signal of the frequency B. The frequency A and B are determined by the control signal of the frequency switching circuit 105. That is, the frequency switching circuit 105 switches the frequencies A and B by a control signal from a microcomputer (not shown). Further, since the control of taking in the coin signals A and B is also performed by a microcomputer or the like, the determination of whether the coin signal corresponding to the control signal of the frequency switching circuit 105 is A or B is performed by the microcomputer or the like.

  Since the coin discriminating apparatus according to the first embodiment of the present invention excites at a plurality of frequencies, it can discriminate coins made of a plurality of materials such as clad coins. Further, since the frequency is switched in a time division manner, only one oscillation coil and one reception coil are required, and the cost can be reduced. Furthermore, by providing an oscillation circuit that outputs each frequency, there is no restriction such as a rise time required when switching the frequency, and high-speed processing is possible, thereby achieving a high-resolution and high-performance identification device.

FIG. 3 is a configuration diagram of a coin identifying apparatus according to the second embodiment of the present invention.
The coin identification device according to the second exemplary embodiment of the present invention includes an oscillation coil 303 on one side of a coin passage 302 through which a coin 301 to be inspected passes, and a coin passage 302 facing the oscillation coil 303. A receiving coil 304 is disposed on the other side.

  The oscillation coil 303 is connected to a sine wave oscillation circuit 305 that outputs a sine wave that excites the oscillation coil 303. The sine wave oscillation circuit 305 outputs either the single frequency A or the single frequency B.

The reception coil 304 is connected to the coin detection circuit 306, and the output of the reception coil 306 is input to the coin detection circuit 306.
FIG. 4 is a configuration diagram of a sine wave oscillation circuit of the coin identifying device according to the second embodiment of the present invention.

  The sine wave oscillation circuit 305 is a BPF (Band Pass Filter) type oscillation circuit, and oscillates within a frequency band determined by (R3 / R2) * (C21 + C22orC21) and R4 + (C31 + C32orC31).

  The oscillation frequency is switched by switching the switches SW1 and SW2. When the switches SW1 and SW2 are ON, a low-frequency oscillation signal is output, and when the switches SW1 and SW2 are OFF, a high-frequency oscillation signal is output.

In the second embodiment, the frequency is switched by switching the switch inside the sine wave oscillation circuit 305. Other configurations and operations are the same as those in the first embodiment.
In the coin discriminating apparatus according to the second embodiment of the present invention, since the oscillation circuit can output a plurality of frequencies, only one oscillation circuit is required, and miniaturization and cost reduction are possible.

FIG. 5 is a configuration diagram of a coin identifying apparatus according to the third embodiment of the present invention.
The coin discriminating apparatus according to the third embodiment of the present invention has a first oscillation coil 503 on one side of a coin passage 502 through which a test coin 501 to be inspected passes, and a coin facing the oscillation coil 503. A second oscillation coil 504 connected to the first oscillation coil 503 is disposed on the other side of the passage.

  The first oscillation coil 503 is connected to a frequency switching circuit 505 for switching signals for exciting the oscillation coils 503 and 504, and the frequency switching circuit 505 outputs a first sine wave oscillation circuit that outputs a sine wave of a single frequency A. 506 and a second sine wave oscillation circuit 507 that outputs a sine wave having a single frequency B, respectively.

  The second oscillation coil 504 is connected to the coin detection circuit 508, and the output of the oscillation coil 504 is input to the coin detection circuit 508. The operation of the coin detection circuit 508 is the same as that of the first embodiment, and the coin signal A or B is output according to the frequency for exciting the coin 501 to be examined. Coin signal A and coin signal B are input to a coin discrimination circuit (not shown) connected to coin detection circuit 508. Based on the coin signals A and B, in a coin discriminating circuit (not shown), whether the coin to be examined is a genuine coin or a fake coin is discriminated as to whether it is true or false and the type is discriminated.

  The oscillation coil shown in FIG. 5 has two coils opposed to each other with a certain interval, and a coin to be tested passes between them. The oscillation coils are connected in series and constitute a magnetic circuit as shown in FIG. Since these coils are magnetically coupled in series, they can be viewed as one coil having a value of L1 + L2 + 2M.

Here, when a test coin (conductor) enters between the detection coils, the coin functions as a secondary winding (one turn) of the transformer, and a circuit as shown in FIG. 7 is formed. Rs shown in the equivalent circuit is the resistance of the conductor, and takes a different value depending on the material of the coin. Rs = ∞ in the absence of coins. The change in Rs appears as a change in the impedance of the detection coil, and by measuring it, the resistance of the conductor (= metal type) can be identified. The resistance of the coin is extremely small, but when viewed from the coil side, the impedances Ls and Rs of the coin are Np ² / Ns ² = Np ² times, which is a detectable level. Np and Ns are the number of turns of each coil.

  In the coin discriminating apparatus according to the third embodiment of the present invention, a current is passed through both coils, so that an equal magnetic field is generated between the two coils, and the test coin passing through the coil approaches one coil. Therefore, the sum of the inductances of the two coils is not affected by the distance from the coin to be examined. Therefore, the output error due to the positional deviation between the receiving coil and the coin to be inspected in the first and second embodiments is reduced, and higher performance is achieved.

FIG. 8 is a block diagram of a coin identifying device according to the fourth embodiment of the present invention.
The coin discriminating apparatus according to the fourth embodiment of the present invention includes a first oscillating coil 803 and a coin facing the oscillating coil 803 on one side of a coin passage 802 through which a test coin 801 to be inspected passes. A second oscillation coil 804 connected to the first oscillation coil 803 is disposed on the other side of the passage.

  The first oscillation coil 803 is connected to a sine wave oscillation circuit 805 that outputs a sine wave that excites the first oscillation coil 803 and the second oscillation coil 804. The sine wave oscillation circuit 805 outputs either the single frequency A or the single frequency B.

The reception coil 804 is connected to the coin detection circuit 806, and the output of the reception coil 806 is input to the coin detection circuit 806.
In the fourth embodiment, the frequency is switched by switching a switch in the sine wave oscillation circuit 805. Other configurations and operations are the same as those of the third embodiment.

FIG. 9 is a configuration diagram of a coin identifying device according to the fifth embodiment of the present invention.
The coin identification device according to the fifth exemplary embodiment of the present invention includes a first oscillating coil 903 and a coin facing the oscillating coil 903 on one side of a coin passage 902 through which a test coin 901 to be inspected passes. A second oscillation coil 904 connected to the first oscillation coil 903 is disposed on the other side of the passage.

  The first oscillation coil 903 is connected to a sine wave oscillation circuit 905 that outputs a sine wave that excites the first oscillation coil 903 and the second oscillation coil 904. The sine wave oscillation circuit 905 outputs a sine wave having a frequency A.

The oscillation coil 904 is connected to the coin detection circuit 906, and the output of the oscillation coil 904 is input to the coin detection circuit 906.
The coin detection circuit 906 includes a reference generation unit having a reference switching unit, and outputs based on the first reference and output based on the second reference with respect to the input of the coin detection circuit 906. Is output.

  When the test coin 901 passes between the first oscillation coil 903 and the second oscillation coil 904, the mutual inductance M between the first oscillation coil 903 and the second oscillation coil 904 changes. Thereby, a signal generated in the oscillation coil 904 changes. Since the change in the mutual inductance M differs depending on the material and type of the coin 901 to be examined, the material and type of the coin 901 to be examined can be determined by examining the signal generated in the oscillation coil 904.

FIG. 10 is a diagram showing a configuration example of a coin detection circuit according to the fifth embodiment of the present invention.
The coin detection circuit 906 includes a switch 1001 switch, resistors 1002 and 1003, a reference generation unit 1012 including a capacitor 1010, resistors 1006 to 1009, and an operational amplifier 1011.

The switch 1001 switch is connected to the resistor 1002 or the resistor 1003 by switching the switch.
The operational amplifier 1011 amplifies and outputs the difference between the input of the coin detection circuit 906 and the signal passed through the reference generation unit 1012.

  The output of the sine wave oscillation circuit 905 is input to the reference generation unit 1012, and the amplitude and phase are changed by the resistance and capacitor of the reference generation unit 1012 and output from the reference generation unit 1012 as a reference signal. The switch 1001 switch is connected to the resistor 1002 or the resistor 1003. The amplitude and phase of the signal output from the reference generation unit 1012 are different depending on the connected resistor. When the switch 1001 switch is connected to the resistor 1002, a signal whose amplitude and phase are changed by the resistor 1002 and the capacitor 1010 is a reference signal A, and when the switch 1001 switch is connected to the resistor 1003, the resistor 1003 and A signal whose amplitude and phase are changed by the capacitor 1010 is set as a reference signal B.

  The changeover switch 1001 is switched a plurality of times while passing between the oscillation coil 903 and the oscillation coil 904. That is, the changeover switch 1001 is switched in a time division manner. As a result, the reference signals A and B are alternately output from the reference generation unit 1012.

  The coin detection circuit 906 is connected to a coin discrimination circuit (not shown). The coin discriminating circuit uses the coin signal when the reference generation unit 1012 outputs the reference signal A as the coin signal A, and sets the coin signal when the reference generation unit 1012 outputs the reference signal B as the coin signal B. . Based on the coin signals A and B, in a coin discriminating circuit (not shown), whether the coin to be examined is a genuine coin or a fake coin is discriminated as to whether it is true or false and the type is discriminated. The discrimination can be made, for example, by comparing the coin signal measured in advance for each coin with the obtained coin signal.

FIG. 11 is a diagram illustrating an example of a coin detection signal and a reference signal according to the fifth embodiment of the present invention.
The sine wave output from the sine wave oscillation circuit 905 is changed in amplitude and phase by the inductance M of the oscillation coils 903 and 904 to become a coin detection signal and input to the coin detection circuit 906, and also input to the reference generation unit 1012. When the switch 1001 switch is connected to the resistor 1002, the amplitude and phase of the sine wave to be changed become the reference signal A by the resistor 1002 and the capacitor 1010.

FIG. 12 is a diagram for explaining the impedance of each part of the coin identifying device according to the fifth embodiment of the present invention.
In the coin discriminating apparatus, an equivalent circuit of a coil and a conductor (test coin) serving as a sensor is shown as a circuit 1201.

The impedance Z _S (hereinafter referred to as sensor impedance) of this circuit is obtained by the following equation (1).

Note that R _S , R ₁ and R ₂ are resistors, L _S is an inductance, and ω is an angular frequency.
An equivalent circuit of the reference generation unit 1012 is expressed as a circuit 1002.
The impedance Z _ref (hereinafter referred to as reference generation unit impedance) of this circuit is obtained by the following equation (2).

R is a resistance, C is a capacitance, and ω is an angular frequency.
Here, _{assuming that} the real part of the sensor impedance Z _S and the reference generation part impedance Z _ref is R and the imaginary part is X, the amplitude | Z | and the phase θ are obtained by the following expressions (3) and (4), respectively. .

These impedances can be expressed as complex vectors as shown in a graph 1203 having an amplitude of | Z | and a phase of θ.
FIG. 13 is a diagram illustrating a complex vector display of voltage.

  The figure shows a complex vector display of the voltages of the reference signals A and B, and a complex vector display of the voltage of the coin detection signal when the single material coins A and B and the composite material coin C are used as the test coins. Yes.

It demonstrates that the composite material coin C can be detected using this.
When the output of the single material coin A, the single material coin B, and the composite material coin C is obtained with reference to the reference signal A, the single material coins A and B have different outputs because the distance from the reference signal A differs. it can. However, since the single material coin B and the composite material coin C have the same distance from the reference signal A, the detection signals are the same and cannot be identified.

  Next, when the outputs of the single material coin A, the single material coin B, and the composite material coin C are obtained on the basis of the reference signal B, since the distances are different, the outputs are also different and can be identified. In this way, since the resistance component and reactance component of the single material coin and the composite material coin are different, even if the distance from a certain reference coincides, the distance from the reference changes by shifting the reference position. It is. Therefore, the composite material can be identified by switching the reference and comparing and discriminating each output signal with the output value measured in advance.

  In addition, since the coin identification device further includes a plate thickness sensor, it is possible to measure the plate pressure of the coin that has passed through the coin passage and use it as an identification item for more accurate identification. This is because if the thickness is the same, the resistance component and reactance component of a single material are uniquely determined, and the resistance component and reactance component of the composite material cannot be simulated.

  According to the fifth embodiment of the present invention, in a coin discriminating apparatus, the identification of a composite material, which has conventionally been discriminated using two frequencies, is detected by exciting one set of sensors at one frequency. By switching the circuit reference, identification of clad coins made of a plurality of materials can be realized with a simple configuration. Thereby, a small, inexpensive, and high-performance coin identification device can be provided.

FIG. 14 is a configuration diagram of a coin identifying device according to the sixth embodiment of the present invention.
The coin discriminating apparatus according to the sixth embodiment of the present invention includes a first oscillation coil 1403 on one side of a coin passage 1402 through which a test coin 1401 to be inspected passes, and a coin facing the oscillation coil 1403. A second oscillation coil 1404 connected to the first oscillation coil 1403 is disposed on the other side of the passage.

  The first oscillation coil 1403 is connected to a sine wave oscillation circuit 1405 that outputs a sine wave that excites the first oscillation coil 1403 and the second oscillation coil 1404. A sine wave oscillation circuit 1405 outputs a sine wave of frequency A.

  The oscillation coil 1404 is connected to the coin detection circuit A1406, and the output of the oscillation coil 1404 is input to the coin detection circuit A1406. The coin detection circuit A 1406 is also connected to the sine wave oscillation circuit 1405, and the output of the sine wave oscillation circuit 1405 is also input. The coin detection circuit A 1406 includes an amplitude difference detection unit, and outputs an amplitude difference from the reference signal as a coin signal A with respect to the input of the coin detection circuit A 1406.

  The coin detection circuit B 1407 is connected to the coin detection circuit A 1406 and the sine wave oscillation circuit 1405, and the outputs of the coin detection circuit A 1406 and the sine wave oscillation circuit 1405 are input. The coin detection circuit B 1407 includes a phase difference detection unit, detects the phase difference between the coin signal A and the excitation signal that is the output of the sine wave oscillation circuit 1405, and outputs it as a coin signal B.

  The coin detection circuit A 1406 and the coin detection circuit B 1407 are connected to a coin discrimination circuit (not shown), and based on the coin signals A and B, whether or not the coin 1401 to be examined is a genuine coin or a false coin is determined and the type. Make a decision. The discrimination can be made, for example, by comparing the amplitude and phase measured in advance for each coin with the obtained coin signal.

FIG. 15 is a diagram illustrating a configuration example of the coin detection circuit A according to the sixth exemplary embodiment of the present invention.
The coin detection circuit A 1406 includes a reference generation unit 1510 including a resistor 1501 and a capacitor 1502, resistors 1503 and 1504, and resistors 1505 to 1508 and a differential amplifier 1511 including an operational amplifier 1509.

The operational amplifier 1509 amplifies and outputs the difference between the input of the coin detection circuit 1406 and the signal passed through the reference generation unit 1510.
The reference generation unit 1510 receives the output of the sine wave oscillation circuit 1405, changes the amplitude and phase by the resistor 1501 and the capacitor 1502, and is output from the reference generation unit 1510 as a reference signal.

FIG. 16 is a diagram illustrating a configuration example of the coin detection circuit B according to the sixth embodiment of the present invention.
The coin detection circuit B 1407 compares the sine wave signal of the coin signal A output from the coin detection circuit A 1406 with the reference voltage V _ref and binarizes the result, and the excitation output from the sine wave oscillation circuit 1405. A comparator 1602 that compares the signal with the reference voltage V _ref and binarizes the result, and an exclusive OR gate 1603 that outputs an exclusive OR of the outputs of the comparators 1601 and 1602 are provided.

  The output of the exclusive OR gate 1603 outputs an H level signal while the output signals of the comparators 1601 and 1602 are different. The phase difference can be obtained by detecting the time of the H level with a coin discriminating circuit (not shown).

FIG. 17 is a diagram illustrating a complex vector display of voltage.
The figure shows a complex vector display of the voltage of the reference signal A output from the reference generation unit 1510, and the output of the oscillation circuit 1404 when the single material coins A and B and the composite material coins C and D are used as coins to be tested. A complex vector representation of the voltage of the coin detection signal is shown.

It demonstrates that the composite material coins C and D can be detected using this.
When the difference in amplitude between the single material coin A, the single material coin B, and the composite material coin C is obtained from the reference signal A, the single material coins A and B can be distinguished because the distance from the reference signal A is different. . However, the coin B and the coin C have the same distance from the reference signal A, and the coin signal A is the same, and therefore cannot be identified. Next, when the phases of the single material coin A, the single material coin B, and the composite material coin C are obtained from the coin signal B, the phases become different, and the coin B and the coin C can be identified.

Further, the composite material coin D has the same phase as that of the single material coin B, but can be detected because the amplitude difference is different.
This is because the resistance component and reactance component are different in the impedance of the single material coin and the composite material coin, so the amplitude and phase from an arbitrary reference are compared with the output value measured in advance and discriminated. Thus, the composite material can be identified.

  Here, the plate thickness sensor not shown in the figure measures the plate thickness of the coins that have passed, and can be used as an identification item for more accurate identification. This is because if the thickness is the same, the single resistance component and the impedance component are uniquely determined, and the composite material and the impedance component cannot be simulated.

  According to the sixth embodiment of the present invention, in the coin discriminating apparatus, the identification of the composite material, which has conventionally been discriminated using two frequencies, is performed by exciting one set of sensors at one frequency and amplitude. By detecting the phase, it is possible to identify a clad coin made of a plurality of materials with a simple configuration. Thereby, a small, inexpensive, and high-performance coin identification device can be provided.

FIG. 18 is a configuration diagram of a coin identifying device according to the seventh embodiment of the present invention.
The coin discriminating apparatus according to the seventh embodiment of the present invention is the first on one side of the coin passage 1402 through which the test coin 1401 to be inspected passes, similarly to the coin discriminating apparatus according to the sixth embodiment. Oscillating coil 1403 and a second oscillating coil 1404 connected to the first oscillating coil 1403 on the other side of the coin passage so as to face the oscillating coil 1403.

  The first oscillation coil 1403 is connected to a sine wave oscillation circuit 1405 that outputs a sine wave that excites the first oscillation coil 1403 and the second oscillation coil 1404. A sine wave oscillation circuit 1405 outputs a sine wave of frequency A.

The oscillation coil 1404 is connected to the coin detection circuit A1406, and the output of the oscillation coil 1404 is input to the coin detection circuit A1406. The coin detection circuit A 1406 is also connected to the sine wave oscillation circuit 1405, and the output of the sine wave oscillation circuit 1405 is also input. The coin detection circuit A 1406 includes an amplitude difference detection unit, and outputs an amplitude difference from the reference signal as a coin signal A with respect to the input of the coin detection circuit A 1406.

  The coin detection circuit B 1407 is connected to the coin detection circuit A 1406 and the sine wave oscillation circuit 1405, and the outputs of the coin detection circuit A 1406 and the sine wave oscillation circuit 1405 are input. The coin detection circuit B 1407 includes a phase difference detection unit, detects the phase difference between the coin signal A and the excitation signal that is the output of the sine wave oscillation circuit 1405, and outputs it as a coin signal B.

  Although the structure and operation | movement of each part of the coin identification device which concerns on 7th Embodiment are the same as that of the coin identification device which concerns on 6th Embodiment, in the coin identification device which concerns on 7th Embodiment, Switches 1408 and 1409 have been added.

  The coin detection circuit A 1406 and the coin detection circuit B 1407 are connected to switches 1408 and 1409 for turning on / off the power of the coin detection circuit A 1406 and the coin detection circuit B 1407, respectively.

Switches 1408 and 1409 are connected to a power source 1410 and are controlled by control signals A and B, respectively.
With the control signals A and B, the coin detection circuit A 1406 and the coin detection circuit B 1407 can be operated in time series. That is, when detecting the amplitude difference, the coin detection circuit A 1406 is turned on, the coin detection circuit B 1407 is turned off, and when detecting the phase difference, the coin detection circuit B 1407 is turned on.

  As described above, the power supply of the circuit is turned on and off as necessary, and the power consumption of the circuit can be reduced by detecting the amplitude and phase in a time division manner.

It is a lineblock diagram of a coin discernment device concerning a 1st embodiment of the present invention. It is the figure which showed the frequency signals A and B added to an oscillation coil with the timing chart. It is a block diagram of the coin identification device which concerns on the 2nd Embodiment of this invention. It is a circuit diagram of a sine wave oscillation circuit. It is a block diagram of the coin identification device which concerns on the 3rd Embodiment of this invention. It is a magnetic circuit of the coil of the coin identification device which concerns on the 3rd Embodiment of this invention. It is the equivalent circuit schematic of the coil of the coin identification device which concerns on 3rd Embodiment. It is a block diagram of the coin identification device which concerns on the 4th Embodiment of this invention.

It is a block diagram of the coin identification device which concerns on the 5th Embodiment of this invention. It is a figure which shows the structural example of the coin detection circuit which concerns on the 5th Embodiment of this invention. It is a figure which shows the example of the coin detection signal and reference signal which concern on the 5th Embodiment of this invention. It is a figure explaining the impedance of each part of the coin discernment device concerning a 5th embodiment of the present invention. It is a figure showing the complex vector display of a voltage. It is a block diagram of the coin identification device which concerns on the 6th Embodiment of this invention. It is a figure which shows the structural example of the coin detection circuit A which concerns on the 6th Embodiment of this invention. It is a figure which shows the structural example of the coin detection circuit B which concerns on the 6th Embodiment of this invention. It is a figure showing the complex vector display of a voltage. It is a block diagram of the coin identification device which concerns on the 7th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Coin to be tested 102 Coin passage 103 Oscillation coil 104 Reception coil 105 Frequency switching circuit 106, 107 Sine wave oscillation circuit 108 Coin detection circuit 301 Test coin 302 Coin passage 303 Oscillation coil 304 Reception coil 305 Sine wave oscillation circuit 306 Coin detection circuit 501 Test coin 502 Coin path 503, 504 Oscillation coil 505 Frequency switching circuit 506, 507 Sine wave oscillation circuit 508 Coin detection circuit 801 Test coin 802 Coin path 803, 804 Oscillation coil 805 Sine wave oscillation circuit 806 Coin detection circuit 901 Test target Inspection coin 902 Coin passage 903, 904 Oscillation coil 905 Sine wave oscillation circuit 906 Coin detection circuit 1201, 1202 Circuit 1203 Graph 1401 Test coin 1402 Coin passage 1403, 1304 Oscillation coil 1 05 sinusoidal oscillation circuit 1406 coin detecting circuit A
1407 Coin detection circuit B
1408, 1309 Switch 1410 Power supply

Claims (14)

Provide a coin passage for coins to pass through,
A first coil on one side of the coin passage and a second coil electromagnetically coupled to the other side of the coin passage opposite to the first coil;
Exciting the first coil with a sine wave signal,
In the identification method for identifying the coin based on the signal output from the second coil,
An identification method, wherein the first coil is excited by time division at at least two frequencies.   The identification method according to claim 1, wherein the at least two frequencies are output from one oscillation circuit.   The identification method according to claim 1, wherein the at least two frequencies are output by an oscillation circuit provided for each frequency. A coin passage through which coins pass,
A first coil disposed on one side of the coin passage;
An electromagnetically coupled second coil facing the first coil disposed on the other side of the coin passage;
An oscillation circuit for outputting a sine wave signal for exciting the first coil;
With
In the identification device for identifying the coin based on the signal output from the second coil,
The identification device according to claim 1, wherein the first coil is excited by time division at at least two frequencies.   5. The identification device according to claim 4, wherein the oscillation circuit is one oscillation circuit that outputs at least two frequencies in a time division manner.   The identification device according to claim 4, wherein the oscillation circuit is a plurality of oscillation circuits that output different single frequencies. Provide a coin passage for coins to pass through,
A first coil on one side of the coin passage and a second coil electromagnetically coupled to the other side of the coin passage opposite to the first coil;
Exciting the first coil with a sine wave signal,
In the identification method for identifying the coin based on the signal output from the second coil,
Generating a signal based on at least two criteria for the signal output from the second coil;
An identification method, wherein the coin is identified based on a signal based on the at least two criteria.   8. The identification method according to claim 7, wherein the at least two or more criteria are switched by time division. A coin passage through which coins pass,
A first coil disposed on one side of the coin passage;
An electromagnetically coupled second coil facing the first coil disposed on the other side of the coin passage;
An oscillation circuit for outputting a sine wave signal for exciting the first coil;
With
In the identification device for identifying the coin based on the signal output from the second coil,
Generating a signal based on at least two criteria for the signal output from the second coil;
An identification device that identifies the coin based on a signal based on the at least two criteria.   The identification device according to claim 9, wherein the at least two criteria are switched by time division. Provide a coin passage for coins to pass through,
A first coil on one side of the coin passage and a second coil electromagnetically coupled to the other side of the coin passage opposite to the first coil;
Exciting the first coil with a sine wave signal,
In the identification method for identifying the coin based on the signal output from the second coil,
Obtaining a difference signal between the signal output from the second coil and a predetermined reference signal;
Find the phase difference between the difference signal and the sine wave signal,
An identification method comprising identifying the coin based on the difference signal and a phase difference.   12. The identification method according to claim 11, wherein the difference signal and the phase difference are obtained in a time division manner. A coin passage through which coins pass,
A first coil disposed on one side of the coin passage;
An electromagnetically coupled second coil facing the first coil disposed on the other side of the coin passage;
An oscillation circuit for outputting a sine wave signal for exciting the first coil;
With
In the identification device for identifying the coin based on the signal output from the second coil,
Obtaining a difference signal between the signal output from the second coil and a predetermined reference signal;
Find the phase difference between the difference signal and the sine wave signal,
An identification device that identifies the coin based on an amplitude and a phase difference of the differential signal.   The identification device according to claim 13, wherein the difference signal and the phase difference are obtained in a time division manner.